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RE: Turtles and Crocodylians are not Reptiles - no? What are they?
> And, consequently, why it would utterly fail as a useful
> criterion for
> boundary conditions of "Reptilia" if you are
> interested in fossil
Oh, avians are actually completely insignificant here. For eithere there has
been a reversion (possible but not highly likely), or therapsids had
modificational (environmental and/or dosage-dependent) sex determination right
up to the earliest radiations of mammals... and 300 Ma is a bit more than 150
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